Thanks Sage!
ceph osd dump: https://pastebin.com/raw/zLPz9DQg
ceph-monstore-tool /var/lib/ceph/mon/ceph-ufm03 dump-keys |grep osd_snap| cut
-c-29 |uniq -c
2 osd_snap / purged_snap_10_000
1 osd_snap / purged_snap_12_000
75 osd_snap / purged_snap_13_000
4 osd_snap / purged_snap_14_000
778106 osd_snap / purged_snap_15_000
861 osd_snap / purged_snap_1_0000
323 osd_snap / purged_snap_4_0000
88 osd_snap / purged_snap_5_0000
2 osd_snap / purged_snap_7_0000
2 osd_snap / purged_snap_8_0000
2 osd_snap / removed_epoch_10_0
1 osd_snap / removed_epoch_12_0
75 osd_snap / removed_epoch_13_0
4 osd_snap / removed_epoch_14_0
2316417 osd_snap / removed_epoch_15_0
970 osd_snap / removed_epoch_1_00
324 osd_snap / removed_epoch_4_00
89 osd_snap / removed_epoch_5_00
2 osd_snap / removed_epoch_7_00
2 osd_snap / removed_epoch_8_00
2 osd_snap / removed_snap_10_00
1 osd_snap / removed_snap_12_00
75 osd_snap / removed_snap_13_00
4 osd_snap / removed_snap_14_00
2720849 osd_snap / removed_snap_15_00
1161 osd_snap / removed_snap_1_000
379 osd_snap / removed_snap_4_000
89 osd_snap / removed_snap_5_000
2 osd_snap / removed_snap_7_000
2 osd_snap / removed_snap_8_000
________________________________
From: Sage Weil <[email protected]>
Sent: Monday, September 23, 2019 9:41 AM
To: Koebbe, Brian <[email protected]>
Cc: [email protected] <[email protected]>; [email protected] <[email protected]>
Subject: Re: [ceph-users] Seemingly unbounded osd_snap keys in monstore.
Normal? Expected?
Hi,
On Mon, 23 Sep 2019, Koebbe, Brian wrote:
> Our cluster has a little over 100 RBDs. Each RBD is snapshotted with a
> typical "frequently", hourly, daily, monthly type of schedule.
> A while back a 4th monitor was temporarily added to the cluster that took
> hours to synchronize with the other 3.
> While trying to figure out why that addition took so long, we discovered that
> our monitors have what seems like a really large number of osd_snap keys:
>
> ​ceph-monstore-tool /var/lib/ceph/mon/xxxxxx dump-keys |awk '{print $1}'|uniq
> -c
> 153 auth
> 2 config
> 10 health
> 1441 logm
> 3 mdsmap
> 313 mgr
> 1 mgr_command_descs
> 3 mgr_metadata
> 163 mgrstat
> 1 mkfs
> 323 mon_config_key
> 1 mon_sync
> 6 monitor
> 1 monitor_store
> 32 monmap
> 120 osd_metadata
> 1 osd_pg_creating
> 5818618 osd_snap
> 41338 osdmap
> 754 paxos
>
> A few questions:
>
> Could this be the cause of the slow addition/synchronization?
Probably!
> Is what looks like an unbounded number of osd_snaps expected?
Maybe. Can you send me the output of 'ceph osd dump'? Also, if you don't
mind doing the dump above and grepping out just the osd_snap keys, so I
can see what they look like and if they match the osd map contents?
Thanks!
sage
> If trimming/compacting them would help, how would one do that?
>
> Thanks,
> Brian
>
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________________________________
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intended recipient, be advised that any unauthorized use, disclosure, copying
or the taking of any action in reliance on the contents of this information is
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